Buckinghamshire · England
Window Mastic in Sedrup
Specialist window mastic for Sedrup: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Gaps where the sill meets the wall
- White mastic on grey or black frames
- Mastic that is falling out in pieces
Sedrup: your questions answered
Can you help a landlord with a rental near Aylesbury station?
Yes, we work for letting agents and landlords. You can ring 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before any work starts.
Will you come out to Sedrup?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
How long will my window job take?
A handful of frames is a short visit, while a whole house takes longer. We confirm the timing with your quote.
Are you ARBOMaster approved?
Yes. We are an ARBOMaster approved applicator, which is run for the Arbo sealant brand.
Where is Mr Mastic based?
We are a Crawley-based firm, with over 20 years’ experience. We work across South East England, London and Scotland.
Can you seal over the old sealant?
No, it will not last. It may look fine at first, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
Can you reach windows above the ground floor?
Yes, if safe access is possible. For high or awkward windows, we’ll tell you what access is needed.
How long should I leave it?
That depends on the sealant used, so please follow the time we give you when we finish.
How we handle window mastic in Sedrup
Over two decades of sealing frames has taught us which products suit which walls. We’re ARBOMaster approved and fully insured, and every job is covered by a 12-month guarantee. We work on uPVC windows, timber windows & doors and aluminium frames, and the jobs we see most are cold air getting in at the frame edge and mastic that has split away from the wall.
Around Sedrup, many homes face open ground, so their windows and doors take the full weather. That exposure dries out and cracks the mastic around frames and sills faster.
Whatever the size of the job, it’s backed by our one-year guarantee.
- Place
- Sedrup (HP17)
- Region
- Buckinghamshire
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
How the job changes by surface
Window sills
Stone and concrete sills have their own joints, including the one between the sill and the frame above. We seal those with a sealant suited to masonry.
Timber windows & doors
Soft or rotten wood cannot be sealed successfully. If we find rot, we’ll tell you before going ahead, as a joiner will need to deal with it.
How the visit works
Every visit runs the same way: we check the joints, protect the area around them, carry out the job and tidy away. Most jobs take a few hours for a handful of frames, longer for a whole house. Somewhere as small as Sedrup, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We check each frame and agree which ones need doing.
- Next the failed sealant is cut away and the joint cleaned.
- Deep gaps are filled with backing rod to set the depth.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- We clear up and check every joint is fully closed.
Preparing for the visit
- Keep children and pets away from the work area
- Let us know about parking restrictions
- For indoor joints, keep the area dry beforehand if you can
Get a quote
Asking for a quote is easy: let us know the job and the location, and roughly how big it is. Photos by email help us understand the job.
Advice
Looking after it afterwards
Good habits help new joints last longer. Our tips:
- Keep drainage slots and sill grooves clear
- Keep paint off silicone joints
- Wipe condensation off the frames
- Wash the frames with mild soapy water
Try not to touch the new joint while it cures, following the cure time we give you. Don’t point a pressure washer at the joints.
Look out for the warning signs: cracks in the mastic, gaps you can see light through, damp on the reveal or mould around the inside of the frame. If you notice one, it’s time to get the joint looked at.
Landlords, agents and businesses in Sedrup
Landlords and agents in Sedrup can book us as well as householders. Resealing between tenancies keeps a property looking cared for before the next move-in.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Nearby places to Sedrup
More services for Sedrup
When to call us in Sedrup
Sun, frost and rain wear sealant out. UV light hardens the outside of the bead, until it loses its stretch and starts to crack.
Any of these means the joints need attention:
- Leaking joints at the ends of sills
- Cold air getting in at the frame edge
- White mastic on grey or black frames
- Old mastic that has gone black or come away
Managing a site like Stone Church of England Combined School? Then its window and door frames need their mastic kept sound, just like a home’s.
What your quote should include
- Which sealant they’ll use, and why
- Whether they’re fully insured
- Which colour the sealant will be
- Is the old sealant removed completely?
When it is not the sealant
Honest advice matters more to us than a booking, so here’s what new sealant won’t do:
- Soft or decayed wood in the frame
- A door that needs adjusting, rehanging or new seals
- Condensation trapped between the panes
If you’re not sure, just ring 0345 464 0079 or drop us an email and we will give you a straight answer.
Surfaces we seal
- Composite doors
- Timber windows & doors
- uPVC windows
- Patio & French doors
- Aluminium frames
- Window sills
What window mastic looks like in Sedrup
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Homes close to St Mary's Church include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame. Rented homes near Aylesbury station change hands often, and sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Sedrup is about 2 miles south-west of Aylesbury, in Buckinghamshire. Our applicators cover window mastic for householders, landlords and businesses in Sedrup and the surrounding area. Sedrup is one of 263 towns and villages in Buckinghamshire where we work for window mastic. Oxford is on our list too, about 17 miles from Sedrup.
Postcode districts we cover here for window mastic: HP17. Other places close to Sedrup include Bishopstone (1 mile south), Walton Court (1 mile east), Upton (2 miles west), Ford (2 miles south-west) and Dinton (2 miles west). Further out, we also cover High Wycombe (12 miles south), Chesham (11 miles south-east), Buckingham (15 miles north-west), Amersham (13 miles south-east), Beaconsfield (15 miles south-east) and Elmhurst (3 miles north-east).
Local landmarks in Sedrup
We work in homes and buildings around The Harrow pub, The Mandeville School and Pebble Brook School and the streets around them. The nearest railway station is Aylesbury station, about 1.7 miles north-east. Well-known places in the area include Dinton Castle (2.1 miles west) and Friars Square (1.8 miles north-east). The countryside around Sedrup includes Beacon Hill and Snakemoor.
Why it’s worth doing now in Sedrup
The work is quick compared with the damage it prevents: the visit takes a few hours for a few frames, or a day or more for a whole house. Leave it until water is coming in and you may need plastering and decorating as well. Older cottages and farmhouses around Sedrup can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
A few things move the cost up or down: the old material and how easily it comes out, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
Why book with us
- Over 20 years’ experience
- Neat joints and a tidy finish
- Sealant colour chosen to suit
- Anti-fungal silicone where joints get wet
Take a look at how sealant jobs are priced or our reviews.